CVE-2026-11171: Critical Integer Overflow in Chrome Blink Engine – Patch Now

Technical summary

CVE-2026-11171 is an integer overflow vulnerability (CWE-472) in Blink's code. Integer overflows occur when arithmetic operations exceed the maximum value a variable can hold, causing wraparound to small or negative values. An attacker can craft HTML to trigger this condition, leading to memory corruption and arbitrary code execution within the Chrome sandbox process. The vulnerability requires user interaction (visiting a malicious page) but no authentication or special privileges. The Chromium security team classified it as Medium severity internally, though the CVSS 3.1 score of 8.8 reflects the high impact of sandbox escape potential.

Business impact

This vulnerability poses a direct threat to user data and system integrity for Chrome users across Windows, macOS, and Linux. Attackers could steal credentials, harvest sensitive information from open tabs, or use the sandbox escape as a stepping stone to system compromise. Organizations with Chrome-heavy workforces face elevated risk, particularly if users browse untrusted content or are targeted by phishing campaigns pointing to exploit sites. The attack surface is broad—any web page, advertisement, or embedded content could deliver the payload.

Affected systems

Google Chrome versions prior to 149.0.7827.53 are affected. The vulnerability impacts Chrome on Windows, macOS, and Linux. Other Chromium-based browsers (Edge, Opera, Brave, etc.) built on affected Chromium versions may also be vulnerable; verify with individual vendors. The listing of apple macos, linux linux_kernel, and microsoft windows as affected vendors indicates the operating system scope, not that the OS itself contains the flaw—the issue resides in Chrome's Blink engine across these platforms.

Exploitability

Exploitability is straightforward: an attacker only needs to host a malicious HTML page and trick a user into visiting it. No social engineering beyond standard phishing tactics is required. No special browser configuration or plugins are needed. The attack succeeds against default Chrome installations. Once a user lands on the page, the integer overflow triggers automatically, making this a practical threat. The lack of CISA KEV listing (as of the vulnerability's publication) suggests it is not yet actively exploited in the wild, but the low technical barrier means exploitation could accelerate rapidly.

Remediation

Update Google Chrome to version 149.0.7827.53 or later immediately. Chrome typically auto-updates, but users should verify they are on the latest version via Settings > About Chrome. For organizations managing Chrome deployments, use Chrome Enterprise policies to force updates across managed devices. No workarounds can fully mitigate the integer overflow itself; patching is the only reliable remediation. If Chrome is not yet patched, restrict user access to untrusted websites and disable JavaScript execution where feasible, though these are temporary measures.

Patch guidance

Patch on sight. This is a remotely exploitable code-execution vulnerability requiring only user interaction, meeting the threshold for immediate deployment. Test the 149.0.7827.53 patch in a small pilot group first to rule out compatibility issues, but do not delay full rollout. Monitor Chrome's release notes and auto-update mechanisms to catch any patch delays. For enterprise Chrome management, deploy the patch via Chrome policies or MDM solutions within 24–48 hours of release validation. Verify patch application by checking chrome://version/ or through your MDM console.

Detection guidance

Network detection is limited because the exploit is delivered via HTTPS-encrypted web traffic. Endpoint detection should focus on Chrome process anomalies: monitor for sandboxed processes spawning unexpected child processes, excessive memory access patterns, or crashes in Blink code paths (visible in crash logs). Look for unusual network connections initiated from Chrome after loading suspicious pages. Threat intelligence feeds may identify known malicious domains hosting exploit pages; use these to block or warn on access. On vulnerable unpatched systems, consider blocking high-risk domains via DNS or proxy until patching is complete.

Why prioritize this

This vulnerability merits urgent attention due to its HIGH CVSS score (8.8), remote exploitability without authentication, and impact on a ubiquitous browser used by billions. Code execution within a browser sandbox is a well-established stepping stone to full system compromise. The low barrier to exploitation and broad attack surface (any website) mean attack campaigns could scale quickly. Although not yet listed in CISA's KEV catalog, the combination of technical feasibility and user reach makes this a top-tier patching priority.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) reflects: (1) Network-based attack vector with no special access required, (2) Low attack complexity—a crafted HTML page is sufficient, (3) User interaction required (visiting a malicious page), and (4) High impact on confidentiality, integrity, and availability within the scope of the browser process and its data. The sandbox containment prevents OS-level compromise in the base case, preventing a CRITICAL rating, but does not eliminate the threat because sandboxes can be escaped or combined with other vulnerabilities.

Frequently asked questions